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首页> 外文会议>SPIE Conference on Biomedical Applications in Molecular, Structural, and Functional Imaging >Transmit Filter Design Methods for Magnetic Particle Imaging
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Transmit Filter Design Methods for Magnetic Particle Imaging

机译：传输滤波器设计方法用于磁粒子成像

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Magnetic particle imaging (MPI) has emerged as a new imaging modality that uses the nonlinear magnetization behavior of superparamagnetic particles. Due to the need to avoid contamination of particle signals with the simultaneous excitation signal, MPI transmit systems require different design considerations from those in MRI, where excitation and detection are temporally decoupled. Specifically, higher order harmonic distortion in the transmit spectrum can feed through to and contaminate the received signal spectrum. In a prototype MPI scanner, this distortion needs to be attenuated by 90 dB at all frequencies. In this paper, we describe two methods of filtering out harmonic distortion in the transmit spectrum. The first method uses a Butterworth topology while the second a cascaded Butterworth-elliptic topology. We show that whereas the Butterworth filter alone achieves around 16 and 32 dB attenuation at the second and third harmonics, the cascaded filter can achieve around 65 and 73 dB at these harmonics. Finally, we discuss how notch placement in the stopband can also be applied to design highpass filters for MPI detection systems.
机译：磁性颗粒成像（MPI）已作为使用超顺磁性颗粒的非线性磁化行为的新成像模态。由于需要避免使用同时激励信号污染粒子信号，MPI透射系统需要来自MRI中的不同的设计考虑因素，其中激发和检测在时间上分离。具体地，发射频谱中的高阶谐波失真可以馈送到并污染接收的信号谱。在原型MPI扫描仪中，这种失真需要在所有频率下衰减90 dB。在本文中，我们描述了在发射频谱中过滤谐波失真的两种方法。第一种方法使用Butterworth拓扑，而第二个级联的Butterworth-椭圆拓扑。我们表明，在第二和第三谐波中，单独的Butterworth滤波器达到16和32 dB衰减，级联过滤器可以在这些谐波中实现约65和73 dB。最后，我们讨论如何将陷阱放置在阻带中，也可以应用于用于MPI检测系统的高通滤波器。

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